[Event "VII Continental Americano"] [Site "Mar del Plata, ARG"] [Date "2012.10.14"] [Round "4.10"] [White "Toth, Christian Endre"] [Black "Hernandez Guerrero, Gilberto"] [Result "0-1"] [ECO "E11"] [WhiteElo "2357"] [BlackElo "2531"] [Annotator "Sergio Slipak"] [PlyCount "54"] [EventDate "2012.??.??"] {In the fourth round, the Mexican GM Gilberto Hernandez, who has resided in Argentina for a number of years, showed good form in his win over the Brazilian IM Christian Toth.} 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Qe7 5. Bg2 Nc6 6. Nf3 Bxd2+ 7. Nbxd2 {Positionally, the natural way to capture would be with the queen, to allow the knight to develop to c3, however this would run into tactical issues.} (7. Qxd2 Ne4 $1 8. Qc2 Qb4+ $1 9. Nc3 (9. Nbd2 {would be worse.} Nxd2 {and White loses a pawn.} 10. Qxd2 (10. Nxd2 Nxd4) 10... Qxc4) 9... Nxc3 10. Qxc3 Qxc3+ 11. bxc3 {Black has a comfortable endgame in view of White's poor pawn structure.}) 7... O-O 8. O-O d6 9. e4 e5 10. d5 Nb8 { Gilberto plays the classic plan for black in this line: right after exchanging the dark-squared bishop, he places his pawns on those squares to give his remaining bishop free rein.} 11. Ne1 a5 12. Nd3 Na6 13. Qc2 {White needs to be careful, since if he is not active enough, he can quickly be inferior as a result of his "bad" bishop being boxed in by the pawns. As a rule, the best plan is to take all the space possible, since that is White's main trump.} ({ A typical maneuver is} 13. f4) 13... Bd7 14. b3 c6 $1 {If we agree that Black's problem is his lack of space then his goal should be to fight to recover it.} 15. dxc6 Bxc6 16. Rac1 h6 17. Rfe1 Rfc8 18. Nb1 {Aiming for c3, from which it can effectively control the b5 and d5 squares.} b5 $1 {Gilberto continues to grow on the queenside.} 19. Qd2 $6 ({Correct was} 19. cxb5 Bxb5 20. Nc3) 19... b4 $1 {Effectively highlighting the poor placement of the knight on b1.} 20. a4 $2 {A mistake that loses material.} bxa3 21. Nxa3 {If we look at the pawns on b3 and e4 we can easily see that both are tactical weaknesses since both are attacked an equal number of times: e4 is attacked twice and defended twice, while b3 is waiting to be attacked. If we can create a further threat to both these points, White may find defending them overwhelming.} Qb7 $1 {The game is now over.} 22. Rb1 Nxe4 23. Qe3 Ng5 { Creating a decisive attack on the long diagonal.} 24. h4 Bxg2 25. hxg5 hxg5 26. Nb5 Rd8 27. Kh2 g4 0-1